03704cas|a2200385 i 4500 20260817162225.0 170399s1993 th uzm rtt 00| a1eng d .b10078903 AIT Thesis no.EV-93-06 Cheema, Muhammad Javaid Anaerobic degradation of chlorophenols Bangkok : Asian Institute of Technology, 1993 133 leaves + 1 online resource Thesis ; no. EV-93-06 A thesis submitted in partial fulfillment of the requirements for the Degree of Master of Engineering Thesis (M.Eng.) - Asian Institute of Technology, 1993 Two lab scale anaerobic filters (AFs) were operated to investigate the potential of AFs for the treatment of chlorophenolic wastewater. With AF1, a substrate loading rate of 150 mg/l/day (2-MCP) was possible and with AF2, 20 mg/I/day (2,4,6-TCP) was completely dechlorinated, but major intermediate degradation product, 4-MCP was virtually persistent. About 91 % of total influent TCP organic carbon was converted to 4-MCP. And AF2, community did not have species that could degrade 4-MCP. TCP follow pathways i. e, TCP-> 2,4-DCP--> 4-MCP and 2,4-DCP --> 2-MCP -->phenol. Very less concentration of 2- MCP could be detected in the reactor effluent. The TOC reduction was about 98 % , with mass balance 82 % , and 18 % of the carbon was being utilized for biomass production. In both AFs effluent pH increased (6.8 to 7.9),due to consumption of hydrogen ions, while _reduction of sulfate to H2S and Hs·. SEM study of reactor sludge, fed with 2-MCP showed the dominancy of Methanothrix and Desulfovibrio spp. Concentration of maximum influent possible chloride ions and actual effluent concentration were same, which confirmed that the chlorophenols reduction was due to the biodegradation mechanism, through reductive dechlorination but not due to volatilization, or some abiotic mechanism. Addition of molybdate (20 mM), a specific inhibitor of Sulfate Reducing Bacteria (SRB) completely inhibited the dechlorination of 2-MCP and ring cleavage of phenol did not occur also. But degradation of 2-MCP also completely stopped in the MPBs inhibited enrichment with the addition of 0.5 mM chloroform. So it can be inferred that 2-MCP degradation was not only due to SRBs, but due to syntrophic association with MPBs. Relative disappearance of monochlorophenols isomers, in the TCP acclimated community, was in this order: ortho > meta >para, demonstrated that rate of dechlorination of different monochlorophenol isomers was related to position of chlorine substituent on the benzene ring. Presence of glucose as cosubstrate stimulated, dechlorination of chlorophenols. Sewage Purification Phenol removal Tanaka, Shuzo, Chairperson Chongrak Polprasert, Examination Committee Visvanathan, C., Examination Committee Government of Denmark, Scholarship donor Asian Institute of Technology. Thesis ; no. EV-93-06 Full-Text http://203.159.5.9/ait-thesis/detail.php?q=B16207 .b10078903 mnait x 240410 2 951012 m a x 0 mnait mnarc 22 40 Barcode : 30050120806236 CREATED : 2014-03-28 RECORD # : i12781940 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 Barcode : 30050160055926 CREATED : 2016-11-05 RECORD # : i12974985 LPATRON : 0 LCHKIN : - # RENEWALS : 0 # OVERDUE : 0 IUSE3 : 0 TOT CHKOUT : 0 TOT RENEW : 0 4348 4348 0 0 0 0 MAIN MAIN mnait 2026-08-17 50.00 0 AIT Thesis no.EV-93-06 30050120806236 2026-08-17 16:22:25 3 2026-08-17 22 0 0 0 0 MAIN MAIN mnarc 2026-08-17 0 AIT Thesis no.EV-93-06 30050160055926 2026-08-17 16:22:25 2026-08-17 40